Hi there, sure this happens to every window cleaner once in a while, new customer dirty windows but not terrible , clean them and explain I do them every six weeks is that ok with you, they say fine, second clean done all good, then drive past today forsale board up, oldish couple that seem honest but why do they think it's alright to mug off window cleaners,they know what there doing, should i carry on doing them until sold but very quickly or would you just drop them, oh and a dird has done a big crap on the top window, justice, ha.